J/AJ/145/165 BVRI photometry in NGC 6496 (Fraga+, 2013)
SOAR adaptive optics observations of the globular cluster NGC 6496.
Fraga L., Kunder A., Tokovinin A.
<Astron. J., 145, 165 (2013)>
=2013AJ....145..165F 2013AJ....145..165F
ADC_Keywords: Clusters, globular ; Photometry, UBVRI
Keywords: globular clusters: general - globular clusters: individual: NGC 6496 -
techniques: photometric
Abstract:
We present high-quality BVRI photometric data in the field of globular
cluster NGC6496 obtained with the SOAR Telescope Adaptive Module
(SAM). Our observations were collected as part of the ongoing SAM
commissioning. The distance modulus and cluster color excess as found
from the red clump are (m-M)V=15.71±0.02mag and
E(V-I)=0.28±0.02mag. An age of 10.5±0.5Gyr is determined from the
difference in magnitude between the red clump and the subgiant branch.
These parameters are in excellent agreement with the values derived
from isochrone fitting. From the color-magnitude diagram we find a
metallicity of [Fe/H]=-0.65dex and hence support a disk classification
for NGC 6496. The complete BVRI data set for NGC6469 is made available
in the electronic edition of the Journal.
Description:
Observations of NGC6496 were obtained with the SOAR (SOuthern
Astrophysical Research) telescope Adaptive Module (SAM; installed at
the 4.1m SOAR telescope at Cerro Pachon in Chile) on 2012 May 8 as
part of SAM engineering tests. The SAM can feed corrected images
either to a visitor instrument or to the internal wide-field optical
imager, SAMI. SAMI is equipped with standard Bessell BVRI filters. In
Table2, instrumental magnitudes were transformed into the standard
system.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table2.dat 96 7416 BVRI photometry of 7416 stars in the field of NGC6496
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See also:
VII/202 : Globular Clusters in the Milky Way (Harris, 1997)
J/A+AS/109/1 : CCD photometry of globular clusters (Richtler, 1995)
J/ApJS/93/161 : CCD photometry of 6 globular clusters (Sarajedini+ 1994)
Byte-by-byte Description of file: table2.dat
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Bytes Format Units Label Explanations
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1- 4 I4 --- Star [1/7416] Running source number
<FKT2013] NNNN> in Simbad
6- 7 I2 h RAh Hour of Right Ascension (J2000)
9- 10 I2 min RAm Minute of Right Ascension (J2000)
12- 17 F6.3 s RAs Second of Right Ascension (J2000)
19 A1 --- DE- Sign of the Declination (J2000)
20- 21 I2 deg DEd Degree of Declination (J2000)
23- 24 I2 arcmin DEm Arcminute of Declination (J2000)
26- 30 F5.2 arcsec DEs Arcsecond of Declination (J2000)
32- 37 F6.3 mag Bmag ?=99.999 The B band magnitude (1)
39- 44 F6.3 mag e_Bmag ?=99.999 Formal FSF fitting uncertainty in Bmag
46- 51 F6.3 mag Vmag The V band magnitude (1)
53- 57 F5.3 mag e_Vmag Formal FSF fitting uncertainty in Vmag
59- 63 F5.3 mag s_Vmag RMS frame-to-frame variations in Vmag
65- 70 F6.3 mag Rmag The R band magnitude (1)
72- 76 F5.3 mag e_Rmag Formal FSF fitting uncertainty in Rmag
78- 83 F6.3 mag Imag ?=99.999 The I band magnitude (1)
85- 90 F6.3 mag e_Imag ?=99.999 Formal FSF fitting uncertainty in Imag
92- 96 F5.3 mag s_Imag ?=9.999 RMS frame-to-frame variations in Imag
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Note (1): Given in the standard system.
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History:
From electronic version of the journal
(End) Greg Schwarz [AAS], Sylvain Guehenneux [CDS] 02-Jun-2014